Wind power has been used for thousands of years but was replaced by steam, petrol, and electricity in the past 250 years. However, wind is a renewable source of energy driven by the sun's energy and will continue to blow as long as the sun shines. While wind power is clean and renewable, it requires large areas of land for turbines and each turbine only produces 3 megawatts, so many are needed to match a power station. Turbines convert the kinetic energy of wind into rotational motion that spins generators to produce electricity.